i'd be hesitant to put anything around the bottom of the screwdriver
if it comes off, you'll have to take the head off to get it back out
(in other words - don't)
have a buddy help with the screwdriver so you don't get it bound up or hurt anything
or just use ant's way and put it back together
test with the screwdriver when you get close (once you've felt the puff of air) and adjust the crank accordingly
fire it up and if it sounds wrong, you're 180 off - no big deal
if it's distributor driven, take out distributor, rotate 180 and you're golden